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Are you getting an error code on control board?
Does the flash not change when it fails to work? If it does not light we should get a different code.
Sounds like a defective board to me. As you can see by chart I sent, board should be giving us an error code if furnace does not work properly.
I hate to condemn the board without being there, but the board is there to help us troubleshoot.If the board is not giving us an error code when we know there is an error, board is failing to do its job.
You should see a drop down list to request a refund.
I have opened to other experts. First you indicated that purge fan was running.That is good.But you also stated gas flows but igniter does not glow.That is not good. Then you stated after checking again that purge fan does not spin.That is not good.If purge fan does not spin you should automatically get an open pressure switch code and board should definitely not allow gas to flow.You state that although purge fan motor does not work and igniter does not work, we get an "all clear" normal code. All point to a failing board.
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